Solving Graphically
Key Questions

Answer:
See below
Explanation:
 One or both of the equations are not graphed correctly.
 Student does not realize that the solution is the intersection of the equations.

Yes, it is not possible to draw a picture for an equation if it has more than three variables.
I hope that this was helpful.

3 possibilities are possible with a system of equations.
Scenario I  Infinite Solutions (All real numbers)
The linear equations the same.
Scenario II  No solution
The linear equations are parallel so they never touch.
Scenario III  1 solution
The linear equations intersect and the ordered pair is the solution.
Please see the video example below.